112 years old now in 2025 - what year born?

Today, 8 July 2025 if a person is 112 years old now, what year was he born? See below:

If 112 years old, year of birth is:
1912 or 1913*

*It depends on whether he was born before or after 1 January 1913.

If now 112 years and his year of birth 1912 if he was born after 8 July 1912 until 31 december 1912 inclusively, and his year of birth is 1913 if he was born from 1 January 1913 to 8 July 1913.

Other examples:

If now 12 years, year of birth 2012 or 2013
If now 18 years, year of birth 2006 or 2007
If now 27 years, year of birth 1997 or 1998
If now 50 years, year of birth 1974 or 1975

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